[Elecraft] dBi dBd correction

Ron D'Eau Claire ron at cobi.biz
Wed May 6 17:31:33 EDT 2009


Yeah, I misread the rule. I thought the rule was saying a dipole was 0 dbi,
not 0 dBd! Didn't make sense to me.

Gus, KB0YH also caught my mistake.  

Tnx for un-kinking my brain Guys!

73,

Ron 

-----Original Message-----

Ron,

The FCC regulations for 60 meter power is referenced to the maximum lobe 
of a dipole.  Sooo --
That should be "0 dBd" (gain/loss relative to a dipole) rather than "0 
dBi" (gain relative to an isotropic radiator).
If my recollection is correct, 0 dBd is 2.15 dB greater than 0 dBi in 
the dipole's favored directions (perpendicular to the radiator).
For those not familiar with an isotropic radiator, it is a point 
construct in free-space that radiates equally in all directions.

73,
Don W3FPR



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